Merge worktree-hooks-b-bash-seam into worktree-hooks-c-interception
Bring the interception-seams branch onto current master (via A→B). The substantive reconciliation is master's compaction `agent/pre-step` serial seam meeting C's interception seams: - types.ts: keep BOTH master's `agent/pre-step` AND C's new interception events (`agent/prompt-submit`, `agent/session-start`, `agent/turn-continuation`→ `ContinuationDecision`); drop the turn-mirror declarations (removed on A). - loop.ts: the merged per-turn order is `turn/start` → per queued msg `agent/prompt-submit` (rewrite/inject/block) → (fully-blocked ⇒ zero-step `rejected`) → per step: drain steering → assemble system prompt → `agent/pre-step` (compaction, OUTSIDE the step) → `step/start` → single `deriveMessages()` → model → tools/pre-execute·dispatch·post-execute. No turn-mirror emits; `closeTurn()` is the A-simplified single-call form. - Docs (architecture, core.md, agent/agent-loop READMEs, catalog) reconciled to show C's interception seams alongside `agent/pre-step`, no turn/step mirrors. - rfc/README: dropped the stale `proposed/` compaction row (master moved that RFC to implemented/); kept C's new `pre-tool-input-rewrite` proposed row. - interception.spec.ts: migrated its two `agent/turn-end` reason collectors to the `turn/end` session event, and ADDED a cross-test proving a `prompt-submit` rewrite + additionalContext is VISIBLE to an `agent/pre-step` listener on the same turn — pinning the merged seam ordering (compaction sees the post-prompt-submit surface, not stale history).
This commit is contained in:
Tianyi Cui
@@ -57,7 +57,7 @@ Also defines `TurnTriggerMap` and `TurnEndReasonMap` (merge-extensible sum types
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Every `SessionEvent` carries two optional top-level fields (structural metadata):
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- `sourceEventSeqs?: number[]` — seq numbers of provenance sources (e.g., the `assistant/chunk` seqs behind an `assistant/message`, or the shadowed nodes behind a compaction marker).
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- `sourceEventSeqs?: number[]` — seq numbers of provenance sources (e.g., the `assistant/chunk` seqs behind an `assistant/message`, or the shadowed nodes behind a compaction replace node).
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- `surfaceOp?: SurfaceOp` — how this event entered the surface. Absent for non-surface events (boundaries, chunks, usage, errors).
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### Metadata types (`types.ts`)
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@@ -68,7 +68,7 @@ Every `SessionEvent` carries two optional top-level fields (structural metadata)
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- Persistence plugins: subscribe to `session/event` (write-behind) and drain on `session/flush` (awaited) and fiber dispose. A durable backend reads the log and reloads it into a live session; the metadata seam (`SessionHeader`, `session.header`) is what such a backend stores beside the log.
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- Replay/fork: `ctx.sessions.create(id, { seed })` seeds a new session with an existing event log. The surface rebuilds deterministically from `surfaceOp` markers in the seeded events. The seed is validated to the SAME invariants `append` enforces — including that every surface-eligible event (`SurfaceEventType`) carries a `surfaceOp` marker — so a marker-less message event is rejected at construction rather than silently vanishing from `deriveMessages()` (the surface is the sole derivation path) on resume.
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- Compaction: a future plugin appends a new event with `surfaceOp: { op: 'replace', start, end }` to shadow old surface nodes.
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- Compaction: the `dsh-compact-basic` plugin appends a `user/message` with `surfaceOp: { op: 'replace', start, end }` to shadow old surface nodes behind a summary checkpoint.
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### What is NOT here (TODO)
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@@ -19,6 +19,7 @@ export { isJsonValue } from './json.ts'
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export { interruptedTurnClosers } from './repair.ts'
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export type { SurfaceNode } from './surface.ts'
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export { isSurfaceEvent, isSurfaceEligibleType } from './surface.ts'
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export { isToolPairingBalanced } from './tool-pairing.ts'
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declare module 'cordis' {
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interface Context {
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100
packages/core/session/src/tool-pairing.ts
Normal file
100
packages/core/session/src/tool-pairing.ts
Normal file
@@ -0,0 +1,100 @@
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/**
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* Tool-pairing balance over a session's SURFACE: is a given cut point in the
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* surface a safe edge for a collapsed region (e.g. compaction)?
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*
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* The invariant a consumer needs: a collapsed region must never separate an
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* `assistant/message`'s `tool-call` blocks from their answering `tool/result`s
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* — that would leave the rehydrated transcript with a dangling tool-call or an
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* orphaned tool-result, which every provider rejects. (This is the
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* compaction-time mirror of the crash-recovery imbalance that
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* {@link interruptedTurnClosers} repairs on load.) Steps were once used as a
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* proxy for this bracketing, but a compaction REWRITES the surface — it lands a
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* replacement node at a high log seq whose SURFACE position is the head — so a
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* scan over the LOG's `step/*` markers mis-reads such a node's neighbours. The
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* pairing the invariant actually protects lives in the surface nodes' own
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* content (a `tool-call` block's id, a `tool/result`'s `callId`), which travels
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* with the node through any reshaping, so alignment is decided over the surface
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* directly.
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*
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* A **cut** is a gap between two adjacent surface nodes (named by the node it
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* sits immediately before), or the after-tail gap (`null`). Walking the surface
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* head→tail and assigning each node a delta — `+1` per `tool-call` block on an
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* `assistant/message`, `-1` per `tool/result`, `0` otherwise — the depth at a
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* cut is the number of still-unanswered tool calls before it. A cut is
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* **balanced** when that depth is `0`. A region `[start..end]` is safe to
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* collapse iff BOTH its edges are balanced cuts: the cut before `start` and the
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* cut after `end`. Nodes that belong to no step (a pre-step `user/message`, an
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* inter-step `steering/message`, an injection `context/message`) carry no
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* pairing, contribute `0`, and so are free boundaries — exactly as before, but
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* now as a consequence of the balance rather than a special case. An open
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* trailing step (an assistant whose `tool/result`s have not landed yet) keeps
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* the depth positive through the tail, so no cut inside it is balanced — the
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* old explicit open-step check falls out of the same counter.
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*
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* @module @deepseek-ai/dsh-session/tool-pairing
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*/
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import type { SessionEvent } from './types.ts'
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import type { SurfaceNode } from './surface.ts'
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/**
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* The tool-pairing delta of a surface node: how it shifts the count of
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* unanswered tool calls. An `assistant/message` opens one bracket per
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* `tool-call` block; a `tool/result` closes one; every other surface node
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* (`user/message`, `context/message`, `steering/message`, a usage-only
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* `assistant/message` with no tool-call blocks) is pairing-neutral.
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*/
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function nodeDelta(event: SessionEvent): number {
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switch (event.type) {
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case 'assistant/message':
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return event.data.content.filter(block => block.type === 'tool-call').length
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case 'tool/result':
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return -1
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// Non-pairing surface nodes and every non-surface event contribute nothing.
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default:
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return 0
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}
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}
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/**
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* Whether the surface prefix ending at the given cut has BALANCED tool-call /
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* tool-result brackets — i.e. every `tool-call` block on the surface before the
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* cut has its answering `tool/result` before the cut too, so the cut is a safe
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* edge for a collapsed region (it cannot split an assistant↔result pair).
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*
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* `nodes` is the surface linked list in head→tail order (e.g.
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* `session.surface.nodes`); `events` is the session log, used to look each
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* node's event up by `seq`. `beforeSeq` names the cut by the surface node it
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* sits immediately before; the after-tail cut (the whole surface) is `null`,
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* as is any `beforeSeq` not present on the surface.
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*
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* A region `[start..end]` is collapsible iff both edges are balanced cuts: call
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* `isToolPairingBalanced(nodes, events, start)` for the cut before `start`, and
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* `isToolPairingBalanced(nodes, events, after)` — where `after` is `end`'s
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* surface successor (`SurfaceNode.next`), or `null` when `end` is the tail —
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* for the cut after `end`.
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*
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* @throws if the surface prefix drives the unanswered-call depth negative — a
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* `tool/result` with no preceding open `tool-call` on the surface. That is a
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* corrupt surface (a structural invariant violation), surfaced loudly here
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* rather than silently mis-classifying a boundary.
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*/
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export function isToolPairingBalanced(
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nodes: readonly SurfaceNode[],
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events: readonly SessionEvent[],
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beforeSeq: number | null,
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): boolean {
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let depth = 0
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for (const node of nodes) {
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if (node.seq === beforeSeq) return depth === 0
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// node.seq is a surface-node seq, always a valid log index by construction.
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// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
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depth += nodeDelta(events[node.seq]!)
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if (depth < 0) {
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throw new Error(`tool-pairing balance: tool/result at surface seq ${node.seq} has no matching tool-call (corrupt surface)`)
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}
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}
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// Reached the after-tail cut (beforeSeq === null, or a seq not on the
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// surface): the whole-surface prefix is balanced iff depth returned to 0.
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return depth === 0
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}
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@@ -184,7 +184,8 @@ export interface TodoItem {
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* same events; trace/telemetry = subscribe to the log.
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*
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* Merge-extensible: plugins declare extra event types via declaration merging
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* (e.g. a compaction plugin adds `'compaction/marker'`).
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* (e.g. the compaction plugin adds `'compact/start'`, `'compact/summary'`,
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* `'compact/end'`).
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*
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* Durability contract (what a persistence backend relies on): the durable log
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* persists every event verbatim, INCLUDING `assistant/chunk` — `seq` must stay
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@@ -321,7 +322,7 @@ export type SessionEvent<T extends SessionEventType = SessionEventType> = {
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/**
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* Seq numbers of events that are provenance sources of this event
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* (e.g. the `assistant/chunk` seqs that built an `assistant/message`,
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* or the surface nodes shadowed by a compaction marker).
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* or the surface nodes shadowed by a compaction replace node).
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*/
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sourceEventSeqs?: number[]
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/** How this event entered the surface; absent for non-surface events. */
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@@ -278,6 +278,23 @@ describe('Session.append surface opts', () => {
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// The string 'append' is a primitive — identity-preserving is fine.
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expect(event.surfaceOp).toBe('append')
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})
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it('isSurfaceEvent rejects a surface-eligible type missing its surfaceOp marker', () => {
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// A raw event (not built via append, which mandates the marker) of a
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// surface-eligible type but with no surfaceOp must NOT narrow to a
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// SurfaceEvent — it would otherwise be silently dropped from the surface.
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const noMarker: SessionEvent = {
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type: 'user/message', seq: 0, time: 1,
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data: { content: [{ type: 'text', text: 'hi' }], source: { kind: 'user' } },
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}
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expect(isSurfaceEvent(noMarker)).toBe(false)
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// A non-surface type is rejected too (the type gate).
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const boundary: SessionEvent = { type: 'turn/start', seq: 1, time: 1, data: { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } } }
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expect(isSurfaceEvent(boundary)).toBe(false)
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// A properly-marked surface event narrows.
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const marked = { ...noMarker, surfaceOp: 'append' } as SurfaceEvent
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expect(isSurfaceEvent(marked)).toBe(true)
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})
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})
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describe('surface type guards', () => {
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314
packages/core/session/tests/tool-pairing.spec.ts
Normal file
314
packages/core/session/tests/tool-pairing.spec.ts
Normal file
@@ -0,0 +1,314 @@
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import { describe, expect, it } from 'vitest'
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import { CallId } from '@deepseek-ai/dsh-llm'
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import { Session, SessionId, isToolPairingBalanced } from '../src/index.ts'
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import type { SessionEvent, SurfaceNode } from '../src/index.ts'
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/**
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* Unit coverage for the tool-pairing balance check. It decides whether a CUT in
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* the surface (a gap before a given surface node, or the after-tail gap) is a
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* safe edge for a collapsed region (compaction): a region must never split an
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* `assistant/message`'s tool-calls from their `tool/result`s. A cut is balanced
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* when no unanswered tool-call sits before it on the surface. Nodes belonging to
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* no step (pre-step user message, inter-step steering, injection context) are
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* pairing-neutral, so their cuts are free boundaries.
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*
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* The fixtures are built through a real {@link Session} so the surface linked
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* list is derived exactly as production does — including the non-monotonic
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* surface a `replace` op leaves (a compaction checkpoint at a high log seq
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* sitting at the surface head), which is the case the abandoned log-position
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* scan mis-classified.
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*
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||||
* Builders mirror the agent loop's real append order: queued user messages land
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* BEFORE `step/start`; within a step the order is `assistant/message` then
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* `tool/result`(s); injection turns are a bare `turn/start → context/message →
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* turn/end` with no step.
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*/
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const SURFACE = { surfaceOp: 'append' as const }
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||||
/** Surface nodes + log for a session, the two args the balance check takes. */
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function surfaceOf(session: Session): { nodes: readonly SurfaceNode[]; events: readonly SessionEvent[] } {
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return { nodes: session.surface.nodes, events: session.events }
|
||||
}
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||||
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/** The cut BEFORE the surface node at `seq` is balanced (safe region start). */
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function startBalanced(session: Session, seq: number): boolean {
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const { nodes, events } = surfaceOf(session)
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return isToolPairingBalanced(nodes, events, seq)
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||||
}
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||||
|
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/** The cut AFTER the surface node at `seq` is balanced (safe region end). */
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function endBalanced(session: Session, seq: number): boolean {
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const { nodes, events } = surfaceOf(session)
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const node = nodes.find(n => n.seq === seq)
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if (!node) throw new Error(`seq ${seq} is not a surface node`)
|
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return isToolPairingBalanced(nodes, events, node.next)
|
||||
}
|
||||
|
||||
/** Surface seq of the nth (0-based) event of a given type. */
|
||||
function seqOf(s: Session, type: SessionEvent['type'], nth = 0): number {
|
||||
return s.events.filter(e => e.type === type)[nth]!.seq
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||||
}
|
||||
|
||||
/** A closed turn with one closed step holding an assistant + its tool result. */
|
||||
function toolStepSession(): Session {
|
||||
const s = new Session(SessionId('tool-step'))
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s.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
|
||||
s.append('user/message', { content: [{ type: 'text', text: 'go' }], source: { kind: 'user' } }, SURFACE)
|
||||
s.append('step/start', { turn: 1, step: 1 })
|
||||
s.append('assistant/message', {
|
||||
turn: 1, step: 1,
|
||||
content: [
|
||||
{ type: 'text', text: 'calling' },
|
||||
{ type: 'tool-call', id: CallId('c1'), name: 'bash', arguments: '{}' },
|
||||
],
|
||||
}, SURFACE)
|
||||
s.append('tool/call', { turn: 1, step: 1, callId: CallId('c1'), name: 'bash', arguments: '{}' })
|
||||
s.append('tool/result', { turn: 1, step: 1, callId: CallId('c1'), content: [{ type: 'text', text: 'out' }], isError: false }, SURFACE)
|
||||
s.append('step/end', { turn: 1, step: 1 })
|
||||
s.append('turn/end', { turn: 1, reason: { kind: 'completed' } })
|
||||
return s
|
||||
}
|
||||
|
||||
describe('isToolPairingBalanced — region START (cut before a node)', () => {
|
||||
it('is true for a pre-step user/message (belongs to no step)', () => {
|
||||
const s = toolStepSession()
|
||||
expect(startBalanced(s, seqOf(s, 'user/message'))).toBe(true)
|
||||
})
|
||||
|
||||
it('is true for the first surface node of a step (the assistant/message)', () => {
|
||||
// The cut before the assistant is balanced — nothing unanswered precedes it.
|
||||
const s = toolStepSession()
|
||||
expect(startBalanced(s, seqOf(s, 'assistant/message'))).toBe(true)
|
||||
})
|
||||
|
||||
it('is false for a tool/result whose assistant/message precedes it in the same step', () => {
|
||||
// The cut before the tool/result has one unanswered tool-call (the
|
||||
// assistant's) → starting the region here would orphan that call.
|
||||
const s = toolStepSession()
|
||||
expect(startBalanced(s, seqOf(s, 'tool/result'))).toBe(false)
|
||||
})
|
||||
|
||||
it('is true at the surface head (nothing precedes)', () => {
|
||||
const s = new Session(SessionId('lone'))
|
||||
s.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
|
||||
s.append('user/message', { content: [{ type: 'text', text: 'hi' }], source: { kind: 'user' } }, SURFACE)
|
||||
expect(startBalanced(s, seqOf(s, 'user/message'))).toBe(true)
|
||||
})
|
||||
})
|
||||
|
||||
describe('isToolPairingBalanced — region END (cut after a node)', () => {
|
||||
it('is true for the last surface node of a closed step (the tool/result)', () => {
|
||||
// After the tool/result the assistant's single call is answered → balanced.
|
||||
const s = toolStepSession()
|
||||
expect(endBalanced(s, seqOf(s, 'tool/result'))).toBe(true)
|
||||
})
|
||||
|
||||
it('is false for an assistant/message with a later tool/result in the same step', () => {
|
||||
// After the assistant its tool-call is still unanswered → ending here strands
|
||||
// the result.
|
||||
const s = toolStepSession()
|
||||
expect(endBalanced(s, seqOf(s, 'assistant/message'))).toBe(false)
|
||||
})
|
||||
|
||||
it('is true for a pre-step user/message', () => {
|
||||
const s = toolStepSession()
|
||||
expect(endBalanced(s, seqOf(s, 'user/message'))).toBe(true)
|
||||
})
|
||||
|
||||
it('is false at the tail when the node is inside an open (unclosed) step', () => {
|
||||
// step/start then an assistant tool-call, but no tool/result yet (mid-flight).
|
||||
// The after-tail cut still has one unanswered call → not balanced.
|
||||
const s = new Session(SessionId('open-step'))
|
||||
s.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
|
||||
s.append('step/start', { turn: 1, step: 1 })
|
||||
s.append('assistant/message', {
|
||||
turn: 1, step: 1,
|
||||
content: [{ type: 'tool-call', id: CallId('c1'), name: 'bash', arguments: '{}' }],
|
||||
}, SURFACE)
|
||||
expect(endBalanced(s, seqOf(s, 'assistant/message'))).toBe(false)
|
||||
})
|
||||
|
||||
it('is true at the tail when the node is a trailing inter-step node (step already closed)', () => {
|
||||
// A steering message appended after step/end, at the tail. The prior step's
|
||||
// pair is balanced and steering is neutral → the after-tail cut is balanced.
|
||||
const s = new Session(SessionId('trailing-steer'))
|
||||
s.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
|
||||
s.append('step/start', { turn: 1, step: 1 })
|
||||
s.append('assistant/message', { turn: 1, step: 1, content: [{ type: 'text', text: 'a' }] }, SURFACE)
|
||||
s.append('step/end', { turn: 1, step: 1 })
|
||||
s.append('steering/message', { turn: 1, content: [{ type: 'text', text: 's' }], source: { kind: 'user' } }, SURFACE)
|
||||
expect(endBalanced(s, seqOf(s, 'steering/message'))).toBe(true)
|
||||
})
|
||||
|
||||
it('is true at the tail when no step ever opened', () => {
|
||||
const s = new Session(SessionId('no-step'))
|
||||
s.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
|
||||
s.append('user/message', { content: [{ type: 'text', text: 'hi' }], source: { kind: 'user' } }, SURFACE)
|
||||
expect(endBalanced(s, seqOf(s, 'user/message'))).toBe(true)
|
||||
})
|
||||
})
|
||||
|
||||
describe('isToolPairingBalanced — multiple tool calls in one assistant message', () => {
|
||||
// An assistant message with two tool-calls needs BOTH results before the cut
|
||||
// after it is balanced — depth +2, then -1, -1.
|
||||
function twoCallStep(): Session {
|
||||
const s = new Session(SessionId('two-call'))
|
||||
s.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
|
||||
s.append('step/start', { turn: 1, step: 1 })
|
||||
s.append('assistant/message', {
|
||||
turn: 1, step: 1,
|
||||
content: [
|
||||
{ type: 'tool-call', id: CallId('c1'), name: 'a', arguments: '{}' },
|
||||
{ type: 'tool-call', id: CallId('c2'), name: 'b', arguments: '{}' },
|
||||
],
|
||||
}, SURFACE)
|
||||
s.append('tool/result', { turn: 1, step: 1, callId: CallId('c1'), content: [{ type: 'text', text: '1' }], isError: false }, SURFACE)
|
||||
s.append('tool/result', { turn: 1, step: 1, callId: CallId('c2'), content: [{ type: 'text', text: '2' }], isError: false }, SURFACE)
|
||||
s.append('step/end', { turn: 1, step: 1 })
|
||||
s.append('turn/end', { turn: 1, reason: { kind: 'completed' } })
|
||||
return s
|
||||
}
|
||||
|
||||
it('is unbalanced after the first of two results (one call still open)', () => {
|
||||
const s = twoCallStep()
|
||||
expect(endBalanced(s, seqOf(s, 'tool/result', 0))).toBe(false)
|
||||
})
|
||||
|
||||
it('is balanced after the second result (both calls answered)', () => {
|
||||
const s = twoCallStep()
|
||||
expect(endBalanced(s, seqOf(s, 'tool/result', 1))).toBe(true)
|
||||
})
|
||||
})
|
||||
|
||||
describe('isToolPairingBalanced — a mid-step injection context/message', () => {
|
||||
// A background task-done inject() lands a context/message INSIDE an open step,
|
||||
// between the assistant (with a tool-call) and its tool/result. It is
|
||||
// pairing-neutral, so the cut on EITHER side of it is unbalanced (the call is
|
||||
// still open across it) — it is NOT a free boundary in this position.
|
||||
function midStepInjection(): Session {
|
||||
const s = new Session(SessionId('mid-inject'))
|
||||
s.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
|
||||
s.append('step/start', { turn: 1, step: 1 })
|
||||
s.append('assistant/message', {
|
||||
turn: 1, step: 1,
|
||||
content: [{ type: 'tool-call', id: CallId('c1'), name: 'bash', arguments: '{}' }],
|
||||
}, SURFACE)
|
||||
s.append('context/message', { content: [{ type: 'text', text: 'bg task done' }], source: { kind: 'plugin', plugin: 'tool-bash' } }, SURFACE)
|
||||
s.append('tool/result', { turn: 1, step: 1, callId: CallId('c1'), content: [{ type: 'text', text: 'out' }], isError: false }, SURFACE)
|
||||
s.append('step/end', { turn: 1, step: 1 })
|
||||
s.append('turn/end', { turn: 1, reason: { kind: 'completed' } })
|
||||
return s
|
||||
}
|
||||
|
||||
it('start cut before the mid-step context/message is unbalanced (call still open)', () => {
|
||||
const s = midStepInjection()
|
||||
expect(startBalanced(s, seqOf(s, 'context/message'))).toBe(false)
|
||||
})
|
||||
|
||||
it('end cut after the mid-step context/message is unbalanced (call still open)', () => {
|
||||
const s = midStepInjection()
|
||||
expect(endBalanced(s, seqOf(s, 'context/message'))).toBe(false)
|
||||
})
|
||||
})
|
||||
|
||||
describe('isToolPairingBalanced on an injection turn (no step)', () => {
|
||||
// An idle inject() wraps a context/message in a bare turn/start →
|
||||
// context/message → turn/end with NO step. The context node is a free boundary
|
||||
// both ways (pairing-neutral, nothing open around it).
|
||||
function injectionSession(): Session {
|
||||
const s = new Session(SessionId('injection'))
|
||||
s.append('turn/start', { turn: 1, trigger: { kind: 'injection', source: { kind: 'user' } } })
|
||||
s.append('context/message', { content: [{ type: 'text', text: 'ctx' }], source: { kind: 'user' } }, SURFACE)
|
||||
s.append('turn/end', { turn: 1, reason: { kind: 'completed' } })
|
||||
return s
|
||||
}
|
||||
|
||||
it('start: balanced', () => {
|
||||
const s = injectionSession()
|
||||
expect(startBalanced(s, seqOf(s, 'context/message'))).toBe(true)
|
||||
})
|
||||
|
||||
it('end: balanced', () => {
|
||||
const s = injectionSession()
|
||||
expect(endBalanced(s, seqOf(s, 'context/message'))).toBe(true)
|
||||
})
|
||||
})
|
||||
|
||||
describe('isToolPairingBalanced — CBR-001: a head checkpoint left by a replace op', () => {
|
||||
// The case the log-position scan got wrong. After a compaction, a replacement
|
||||
// user/message lands at a HIGH log seq but sits at the SURFACE head, beside
|
||||
// the still-open step whose events follow it in the log. It carries no
|
||||
// tool-call/result pair (just summarized prose), so it must be a balanced cut
|
||||
// on BOTH sides regardless of its log neighbours.
|
||||
function checkpointHeadedSession(): Session {
|
||||
const s = new Session(SessionId('checkpoint'))
|
||||
// A closed turn with a tool step → surface [u1, asst(call), result].
|
||||
s.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
|
||||
s.append('step/start', { turn: 1, step: 1 })
|
||||
s.append('user/message', { content: [{ type: 'text', text: 'u1' }], source: { kind: 'user' } }, SURFACE)
|
||||
s.append('assistant/message', {
|
||||
turn: 1, step: 1,
|
||||
content: [{ type: 'tool-call', id: CallId('c1'), name: 'bash', arguments: '{}' }],
|
||||
}, SURFACE)
|
||||
s.append('tool/result', { turn: 1, step: 1, callId: CallId('c1'), content: [{ type: 'text', text: 'out' }], isError: false }, SURFACE)
|
||||
s.append('step/end', { turn: 1, step: 1 })
|
||||
s.append('turn/end', { turn: 1, reason: { kind: 'completed' } })
|
||||
// An OPEN turn whose step is in progress (loop fires compaction here).
|
||||
s.append('turn/start', { turn: 2, trigger: { kind: 'message', source: { kind: 'user' } } })
|
||||
s.append('step/start', { turn: 2, step: 1 })
|
||||
// Compaction replaces the whole turn-1 surface ([u1, asst, result]) with one
|
||||
// summary user/message — appended now, so it carries a high log seq.
|
||||
const u1 = seqOf(s, 'user/message')
|
||||
const result = s.events.find(e => e.type === 'tool/result')!.seq
|
||||
s.append('user/message', {
|
||||
content: [{ type: 'text', text: 'CHECKPOINT' }],
|
||||
source: { kind: 'plugin', plugin: 'compact' },
|
||||
}, { surfaceOp: { op: 'replace', start: u1, end: result } })
|
||||
// The step's own assistant/message lands AFTER the checkpoint in the log,
|
||||
// still inside the open step.
|
||||
s.append('assistant/message', { turn: 2, step: 1, content: [{ type: 'text', text: 'a2' }] }, SURFACE)
|
||||
return s
|
||||
}
|
||||
|
||||
it('the head checkpoint sits at the surface head while a later surface node follows it in the log', () => {
|
||||
const s = checkpointHeadedSession()
|
||||
const nodes = s.surface.nodes
|
||||
const checkpointSeq = nodes[0]!.seq
|
||||
// The checkpoint heads the surface, yet a surface node (the open step's
|
||||
// assistant) follows it in LOG order — the exact split between surface
|
||||
// position and log position that the log-position scan tripped on.
|
||||
const laterSurfaceInLog = s.events.find(
|
||||
e => e.seq > checkpointSeq && nodes.some(n => n.seq === e.seq),
|
||||
)
|
||||
expect(laterSurfaceInLog).toBeDefined()
|
||||
expect(nodes[0]!.seq).toBe(checkpointSeq)
|
||||
})
|
||||
|
||||
it('start cut before the head checkpoint is balanced (it is the head)', () => {
|
||||
const s = checkpointHeadedSession()
|
||||
expect(startBalanced(s, s.surface.nodes[0]!.seq)).toBe(true)
|
||||
})
|
||||
|
||||
it('end cut after the head checkpoint is balanced (it carries no tool pair)', () => {
|
||||
// This is the exact assertion the log-position scan failed: the forward log
|
||||
// scan from the checkpoint reached the open step's assistant/message and
|
||||
// wrongly reported mid-step. The surface balance sees a neutral node whose
|
||||
// following cut closes no open call.
|
||||
const s = checkpointHeadedSession()
|
||||
expect(endBalanced(s, s.surface.nodes[0]!.seq)).toBe(true)
|
||||
})
|
||||
})
|
||||
|
||||
describe('isToolPairingBalanced — corrupt surface guard', () => {
|
||||
it('throws when a tool/result has no preceding tool-call (depth goes negative)', () => {
|
||||
// A surface that opens with a tool/result (no assistant call before it) is
|
||||
// structurally corrupt — surfaced loudly rather than mis-classified.
|
||||
const s = new Session(SessionId('corrupt'))
|
||||
s.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
|
||||
s.append('step/start', { turn: 1, step: 1 })
|
||||
s.append('tool/result', { turn: 1, step: 1, callId: CallId('c1'), content: [{ type: 'text', text: 'x' }], isError: false }, SURFACE)
|
||||
const { nodes, events } = surfaceOf(s)
|
||||
expect(() => isToolPairingBalanced(nodes, events, null)).toThrow(/no matching tool-call/)
|
||||
})
|
||||
})
|
||||
Reference in New Issue
Block a user